#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
    int n;
    float rate;
    cin >> n >> rate;
    float benefit = n * 0.01 * rate * 0.8;
    // cout << benefit << endl;
    cout << setiosflags(ios::fixed) << setprecision(2) << n + benefit << endl;
    return 0;
}